Optics Question 820

Question: Two lenses of focal length $ f _{1}=10cm $ and $ f _{2}=20cm $ are kept as shown. The resultant power of combination will be

Options:

A) -10 D

B) 5 D

C) 0

D) 10 D

Show Answer

Answer:

Correct Answer: D

Solution:

[d] $ P=2[ \frac{100}{10}+\frac{100}{-20}+0 ]\text{ P=10 diotre}\text{.} $



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